Special nutritional agent for increasing yield of indigenous grass and preparation method of special nutritional agent

Abstract

The invention relates to the technical field of special nutritional agents for native grass, and particularly discloses a special nutritional agent for yield increase of native grass and a preparation method thereof.The special nutritional agent is prepared from, by weight, 10-30 parts of humic acid, 5-15 parts of amino acid, 15-40 parts of a nitrogen source, 5-20 parts of a phosphorus source, 10-25 parts of a potassium source, 1-10 parts of a medium element additive and 0.1-5 parts of a microelement additive. The water-retaining and root-promoting fertilizer is prepared from the following raw materials in parts by weight: 1-10 parts of an organic-inorganic compound water-retaining and root-promoting agent, 0.01-0.5 part of a plant growth regulator, 1-10 parts of a beneficial microbial agent and 3-15 parts of an organic-inorganic compound water-retaining and root-promoting agent, and a preparation method of the organic-inorganic compound water-retaining and root-promoting agent comprises the following steps: (a) preparation of an activated sodium alginate solution: dissolving sodium alginate in warm water at 60 DEG C; according to the special nutritional agent for increasing the yield of the indigenous grass and the preparation method thereof, water is slowly released during drought, excessive expansion is avoided through a hydrophobic micro-domain during waterlogging, so that the air permeability of soil is maintained, root rot is effectively prevented, meanwhile, a shelter is provided for beneficial microorganisms through the structure, and the survival rate and efficiency of the beneficial microorganisms are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of nutrients for native grasses, specifically a nutrient for increasing the yield of native grasses and its preparation method. Background Technology

[0002] Native grasses, as a core component of regional ecosystems, play an irreplaceable role in soil and water conservation, ecological restoration, and grassland animal husbandry. However, a large area of ​​native grasses in my country grows in arid, semi-arid, or infertile soils. These areas are generally constrained by factors such as water stress, nutrient deficiency, and poor soil structure, resulting in low natural yields and community degradation of native grasses, which seriously affects their ecological functions and economic value.

[0003] Currently, conventional fertilizers or general-purpose water-retaining agents are commonly used to increase the yield of native grasses. While conventional fertilizers can provide basic nutrients such as nitrogen, phosphorus, and potassium, their utilization rate is low in adverse soil conditions, and their effect on stimulating the stress resistance potential of native grasses and improving the root zone microenvironment is limited. On the other hand, most water-retaining agents on the market are superabsorbent resins, which tend to completely gel after absorbing water, clogging soil pores and damaging soil aeration. This can easily lead to root hypoxia and root rot during periods of concentrated rainfall. Furthermore, under drought conditions, their water release curves are unstable, failing to meet the intelligent and slow-release water supply needs.

[0004] Furthermore, although some studies have attempted to combine water-retaining agents with fertilizers, these are mostly physical mixtures with limited functionality, failing to address the challenge of synergistic effects among fertilizers, water, air, and microorganisms. In particular, existing technologies lack mechanisms for intelligent regulation of soil water and air balance, and also fail to provide beneficial microorganisms with a stable microenvironment protected from sudden environmental changes. This results in inconsistent practical application effects, especially under variable non-arable land conditions where the effectiveness is often significantly reduced.

[0005] Therefore, there is an urgent need in this field for a stress-resistant and yield-increasing nutrient agent specifically for native grasses. It can not only provide comprehensive nutrition, but also actively regulate the water, fertilizer, air and heat environment in the root zone, realize intelligent water management, and synergistically promote root development and microbial activity, thereby fundamentally breaking through the current technical bottleneck of low and unstable yield of native grasses under adverse conditions. Summary of the Invention

[0006] To solve the above technical problems, the present invention is achieved through the following technical solution: a special nutrient agent for increasing the yield of native grasses and its preparation method, which is made from the following raw materials in parts by weight:

[0007] Humic acid 10-30 parts, amino acids 5-15 parts, nitrogen source 15-40 parts, phosphorus source 5-20 parts, potassium source 10-25 parts, medium element additives 1-10 parts, trace element additives 0.1-5 parts, plant growth regulators 0.01-0.5 parts, beneficial microbial agents 1-10 parts.

[0008] Preferably, the raw materials further include 3-15 parts of an organic-inorganic composite water-retaining and root-promoting agent, and the preparation method of the organic-inorganic composite water-retaining and root-promoting agent is as follows:

[0009] (a) Preparation of activated sodium alginate solution: Dissolve sodium alginate in 60°C warm water at a weight ratio of 1:10 and stir until completely dissolved to obtain sodium alginate solution;

[0010] (b) Preparation of bentonite suspension: Sodium-based bentonite was slowly added to water at a weight ratio of 1:8 and dispersed by high-speed shearing for 30 minutes to form a stable bentonite suspension;

[0011] (c) Composite crosslinking: The sodium alginate solution obtained in step (a) is slowly added to the bentonite suspension obtained in step (b) under stirring. After mixing evenly, 3% by weight of calcium chloride is added as a crosslinking agent. The mixture is stirred and reacted for 2 hours to allow sodium alginate to undergo ionic crosslinking with calcium ions and to combine with bentonite sheets to form a gel network.

[0012] (d) Hydrophobic modification of silane coupling agent: 1% by weight of silane coupling agent KH-550 is added to the composite gel obtained in step (c), and the mixture is stirred continuously at 80°C for 3 hours to allow the silane coupling agent to undergo a condensation reaction with the bentonite sheets and sodium alginate molecular chains in the gel network after hydrolysis, thereby introducing hydrophobic siloxane bonds.

[0013] (e) Washing and pH adjustment: The modified gel after the reaction in step (d) was washed three times with deionized water to remove unreacted coupling agent and byproducts. Then the pH of the material system was adjusted to 7.0 with dilute hydrochloric acid solution.

[0014] (f) Introducing root-promoting substances: Add 1.5% by weight of potassium humate to the hydrophobically modified composite gel obtained in step (e), and continue stirring for 30 minutes to make it evenly dispersed in the gel network;

[0015] (g) Granulation and drying: The mixture obtained in step (f) is granulated into 2 mm particles by an extrusion granulator, and then dried at low temperature at 80°C. After pulverization, it is sieved to obtain a powdery organic-inorganic composite water-retaining and root-promoting agent with a particle size of 1 mm.

[0016] Preferably, the nitrogen source is one or more of urea, ammonium nitrate, and ammonium sulfate; the phosphorus source is one or more of superphosphate, monoammonium phosphate, and diammonium phosphate; and the potassium source is one or more of potassium sulfate and potassium chloride.

[0017] Preferably, the medium-element additives include one or more of calcium, magnesium, and sulfur; the calcium is gypsum or calcium nitrate, the magnesium is magnesium sulfate, and the sulfur is sulfur or potassium sulfate.

[0018] Preferably, the trace element additive includes at least three of the following: chelates or soluble salts of iron, manganese, zinc, copper, boron, and molybdenum.

[0019] Preferably, the plant growth regulator is one or more of sodium nitrophenolate, brassinolide, and sodium naphthaleneacetate.

[0020] Preferably, the beneficial microbial agent includes one or more of nitrogen-fixing bacteria, phosphate-solubilizing bacteria, potassium-solubilizing bacteria, and arbuscular mycorrhizal fungi.

[0021] A method for preparing a special nutrient agent for increasing the yield of native grasses includes the following steps:

[0022] S1. Mixed pulverization: Humic acid, amino acids, nitrogen source, phosphorus source, potassium source, medium element additives and trace element additives are pulverized separately and passed through an 80-120 mesh sieve to obtain powder of each raw material.

[0023] S2. Preliminary mixing: Put all the powdered raw materials obtained in step 1 into a mixer and mix at room temperature for 20-40 minutes to obtain the basic mixture;

[0024] S3. Add active ingredients: Add the plant growth regulator and beneficial microbial agent to the basic mixture obtained in step 2 in sequence, and continue mixing for 10-20 minutes to ensure uniform mixing;

[0025] S4. Granulation and drying: The final mixture obtained in step 3 is granulated and then dried at a low temperature of 50-70℃ until the moisture content is less than 5%;

[0026] S5. Screening and Packaging: Screen the dried granules, select qualified granules with a particle size of 2-4mm, and seal them for packaging.

[0027] It has the following beneficial effects:

[0028] This invention introduces a unique organic-inorganic composite water-retaining and root-promoting agent modified with a silane coupling agent. This agent not only provides comprehensive and balanced nutrients, but its core additive also has intelligent water management capabilities. It releases water slowly during droughts and avoids excessive expansion during floods through its hydrophobic microdomains, thereby maintaining soil aeration and effectively preventing root rot. At the same time, this structure provides a sanctuary for beneficial microorganisms, significantly improving their survival rate and efficacy. This synergistic system significantly improves the biomass and coverage of native grasses under arid, semi-arid, and infertile soil conditions through multiple functions such as efficient root promotion, water retention and drought resistance, flood prevention and aeration, and microbial protection and efficacy enhancement. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In a first embodiment, the present invention provides a technical solution: a special nutrient agent for increasing the yield of native grasses, made from the following raw materials in parts by weight:

[0031] 10 parts humic acid, 5 parts amino acids, 15 parts nitrogen source, 5 parts phosphorus source, 10 parts potassium source, 1 part medium element additive, 0.1 part trace element additive, 0.01 part plant growth regulator, and 1 part beneficial microbial agent.

[0032] The preparation method is as follows:

[0033] S1. Mixed pulverization: Humic acid, amino acids, nitrogen source, phosphorus source, potassium source, medium element additives and trace element additives are pulverized separately and passed through an 80-mesh sieve to obtain powder of each raw material.

[0034] S2. Preliminary mixing: Put all the powdered raw materials obtained in step 1 into a mixer and mix at room temperature for 20 minutes to obtain the basic mixture;

[0035] S3. Add active ingredients: Add the plant growth regulator and beneficial microbial agent to the basic mixture obtained in step 2 in sequence, and continue mixing for 10 minutes to ensure uniform mixing;

[0036] S4. Granulation and drying: The final mixture obtained in step 3 is granulated and then dried at a low temperature of 50°C until the moisture content is less than 5%;

[0037] S5. Screening and Packaging: Screen the dried granules, select qualified granules with a particle size of 2mm, and seal them for packaging.

[0038] In a second embodiment, the present invention provides a technical solution: a special nutrient agent for increasing the yield of native grasses, made from the following raw materials in parts by weight:

[0039] 20 parts humic acid, 10 parts amino acids, 30 parts nitrogen source, 12 parts phosphorus source, 18 parts potassium source, 5 parts medium element additives, 2 parts trace element additives, 0.2 parts plant growth regulator, and 5 parts beneficial microbial inoculant.

[0040] The preparation method is as follows:

[0041] S1. Mixed pulverization: Humic acid, amino acids, nitrogen source, phosphorus source, potassium source, medium element additives and trace element additives are pulverized separately and passed through a 100-mesh sieve to obtain powder of each raw material.

[0042] S2. Preliminary mixing: Put all the powdered raw materials obtained in step 1 into a mixer and mix at room temperature for 30 minutes to obtain the basic mixture;

[0043] S3. Add active ingredients: Add the plant growth regulator and beneficial microbial agent to the basic mixture obtained in step 2 in sequence, and continue mixing for 15 minutes to ensure uniform mixing;

[0044] S4. Granulation and drying: The final mixture obtained in step 3 is granulated and then dried at a low temperature of 60°C until the moisture content is less than 5%;

[0045] S5. Screening and Packaging: Screen the dried granules, select qualified granules with a particle size of 3mm, and seal them for packaging.

[0046] In a third embodiment, the present invention provides a technical solution: a special nutrient agent for increasing the yield of native grasses, made from the following raw materials in parts by weight:

[0047] 30 parts humic acid, 15 parts amino acids, 40 parts nitrogen source, 20 parts phosphorus source, 25 parts potassium source, 10 parts medium element additives, 5 parts trace element additives, 0.5 parts plant growth regulators, and 10 parts beneficial microbial agents.

[0048] The preparation method is as follows:

[0049] S1. Mixed pulverization: Humic acid, amino acids, nitrogen source, phosphorus source, potassium source, medium element additives and trace element additives are pulverized separately and passed through a 120-mesh sieve to obtain powder of each raw material.

[0050] S2. Preliminary mixing: Put all the powdered raw materials obtained in step 1 into a mixer and mix at room temperature for 40 minutes to obtain the basic mixture;

[0051] S3. Add active ingredients: Add the plant growth regulator and beneficial microbial agent to the basic mixture obtained in step 2 in sequence, and continue mixing for 20 minutes to ensure uniform mixing;

[0052] S4. Granulation and drying: The final mixture obtained in step 3 is granulated and then dried at a low temperature of 70°C until the moisture content is less than 5%;

[0053] S5. Screening and Packaging: Screen the dried granules, select qualified granules with a particle size of 4mm, and seal them for packaging.

[0054] Fourth embodiment, the present invention provides a technical solution: the difference between this embodiment and the first embodiment is that 3 parts of organic-inorganic composite water-retaining and root-promoting agent are added to the raw materials, and the organic-inorganic composite water-retaining and root-promoting agent is added together with the growth regulator and beneficial microbial agent in step 3 to the basic mixture obtained in step 2 for mixing. The other steps are the same as the first embodiment.

[0055] The preparation method of the organic-inorganic composite water-retaining and root-promoting agent is as follows:

[0056] A. Preparation of activated sodium alginate solution: Dissolve sodium alginate in 60℃ warm water at a weight ratio of 1:10, and stir until completely dissolved to obtain sodium alginate solution;

[0057] B. Preparation of bentonite suspension: Sodium-based bentonite is slowly added to water at a weight ratio of 1:8 and dispersed by high-speed shearing for 30 minutes to form a stable bentonite suspension.

[0058] C. Composite crosslinking: The sodium alginate solution obtained in step A is slowly added to the bentonite suspension obtained in step B under stirring. After mixing evenly, 3% by weight of calcium chloride is added as a crosslinking agent. The mixture is stirred and reacted for 2 hours to allow sodium alginate to undergo ionic crosslinking with calcium ions and to simultaneously combine with bentonite sheets to form a gel network.

[0059] D. Hydrophobic modification of silane coupling agent: Add 1% by weight of silane coupling agent KH-550 to the composite gel obtained in step C, and stir continuously at 80°C for 3 hours to allow the silane coupling agent to undergo a condensation reaction with the bentonite sheets and sodium alginate molecular chains in the gel network after hydrolysis, thereby introducing hydrophobic siloxane bonds.

[0060] E. Washing and pH adjustment: Wash the modified gel after the reaction in step D three times with deionized water to remove unreacted coupling agent and byproducts, and then adjust the pH of the material system to 7.0 with dilute hydrochloric acid solution.

[0061] F. Introducing root-promoting substances: Add 1.5% by weight of potassium humate to the hydrophobically modified composite gel obtained in step E, and continue stirring for 30 minutes to ensure that it is evenly dispersed in the gel network.

[0062] G. Granulation and drying: The mixture obtained in step F is granulated into 2mm particles by an extrusion granulator, then dried at low temperature at 80℃, pulverized and sieved to obtain a hydrophobically modified organic-inorganic composite water-retaining and root-promoting agent with a particle size of 1mm.

[0063] Fifth embodiment, the present invention provides a technical solution: the difference between this embodiment and the second embodiment is that 9 parts of organic-inorganic composite water-retaining and root-promoting agent are added to the raw materials, and the organic-inorganic composite water-retaining and root-promoting agent is added together with the growth regulator and beneficial microbial agent in step 3 to the basic mixture obtained in step 2 for mixing. The other steps are the same as those in the second embodiment.

[0064] The preparation method of the organic-inorganic composite water-retaining and root-promoting agent is as follows:

[0065] A. Preparation of activated sodium alginate solution: Dissolve sodium alginate in 60℃ warm water at a weight ratio of 1:10, and stir until completely dissolved to obtain sodium alginate solution;

[0066] B. Preparation of bentonite suspension: Sodium-based bentonite is slowly added to water at a weight ratio of 1:8 and dispersed by high-speed shearing for 30 minutes to form a stable bentonite suspension.

[0067] C. Composite crosslinking: The sodium alginate solution obtained in step A is slowly added to the bentonite suspension obtained in step B under stirring. After mixing evenly, 3% by weight of calcium chloride is added as a crosslinking agent. The mixture is stirred and reacted for 2 hours to allow sodium alginate to undergo ionic crosslinking with calcium ions and to simultaneously combine with bentonite sheets to form a gel network.

[0068] D. Hydrophobic modification of silane coupling agent: Add 1% by weight of silane coupling agent KH-550 to the composite gel obtained in step C, and stir continuously at 80°C for 3 hours to allow the silane coupling agent to undergo a condensation reaction with the bentonite sheets and sodium alginate molecular chains in the gel network after hydrolysis, thereby introducing hydrophobic siloxane bonds.

[0069] E. Washing and pH adjustment: Wash the modified gel after the reaction in step D three times with deionized water to remove unreacted coupling agent and byproducts, and then adjust the pH of the material system to 7.0 with dilute hydrochloric acid solution.

[0070] F. Introducing root-promoting substances: Add 1.5% by weight of potassium humate to the hydrophobically modified composite gel obtained in step E, and continue stirring for 30 minutes to ensure that it is evenly dispersed in the gel network.

[0071] G. Granulation and drying: The mixture obtained in step F is granulated into 2mm particles by an extrusion granulator, then dried at low temperature at 80℃, pulverized and sieved to obtain a hydrophobically modified organic-inorganic composite water-retaining and root-promoting agent with a particle size of 1mm.

[0072] The sixth embodiment of the present invention provides a technical solution: the difference between this embodiment and the third embodiment is that 3 parts of organic-inorganic composite water-retaining and root-promoting agent are added to the raw materials, and the organic-inorganic composite water-retaining and root-promoting agent is added together with the growth regulator and beneficial microbial agent in step 3 to the basic mixture obtained in step 2 for mixing. The other steps are the same as those in the third embodiment.

[0073] The preparation method of the organic-inorganic composite water-retaining and root-promoting agent is as follows:

[0074] A. Preparation of activated sodium alginate solution: Dissolve sodium alginate in 60℃ warm water at a weight ratio of 1:10, and stir until completely dissolved to obtain sodium alginate solution;

[0075] B. Preparation of bentonite suspension: Sodium-based bentonite is slowly added to water at a weight ratio of 1:8 and dispersed by high-speed shearing for 30 minutes to form a stable bentonite suspension.

[0076] C. Composite crosslinking: The sodium alginate solution obtained in step A is slowly added to the bentonite suspension obtained in step B under stirring. After mixing evenly, 3% by weight of calcium chloride is added as a crosslinking agent. The mixture is stirred and reacted for 2 hours to allow sodium alginate to undergo ionic crosslinking with calcium ions and to simultaneously combine with bentonite sheets to form a gel network.

[0077] D. Hydrophobic modification of silane coupling agent: Add 1% by weight of silane coupling agent KH-550 to the composite gel obtained in step C, and stir continuously at 80°C for 3 hours to allow the silane coupling agent to undergo a condensation reaction with the bentonite sheets and sodium alginate molecular chains in the gel network after hydrolysis, thereby introducing hydrophobic siloxane bonds.

[0078] E. Washing and pH adjustment: Wash the modified gel after the reaction in step D three times with deionized water to remove unreacted coupling agent and byproducts, and then adjust the pH of the material system to 7.0 with dilute hydrochloric acid solution.

[0079] F. Introducing root-promoting substances: Add 1.5% by weight of potassium humate to the hydrophobically modified composite gel obtained in step E, and continue stirring for 30 minutes to ensure that it is evenly dispersed in the gel network.

[0080] G. Granulation and drying: The mixture obtained in step F is granulated into 2mm particles by an extrusion granulator, then dried at low temperature at 80℃, pulverized and sieved to obtain a hydrophobically modified organic-inorganic composite water-retaining and root-promoting agent with a particle size of 1mm.

[0081] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A special nutrient agent for increasing the yield of native grasses, characterized in that, Made from the following parts by weight of raw materials: Humic acid 10-30 parts, amino acids 5-15 parts, nitrogen source 15-40 parts, phosphorus source 5-20 parts, potassium source 10-25 parts, medium element additives 1-10 parts, trace element additives 0.1-5 parts, plant growth regulators 0.01-0.5 parts, beneficial microbial agents 1-10 parts.

2. The special nutrient agent for increasing the yield of native grasses according to claim 1, characterized in that, The raw materials also include 3-15 parts of an organic-inorganic composite water-retaining and root-promoting agent. The preparation method of the organic-inorganic composite water-retaining and root-promoting agent is as follows: (a) Preparation of activated sodium alginate solution: Dissolve sodium alginate in 60°C warm water at a weight ratio of 1:10 and stir until completely dissolved to obtain sodium alginate solution; (b) Preparation of bentonite suspension: Sodium-based bentonite was slowly added to water at a weight ratio of 1:8 and dispersed by high-speed shearing for 30 minutes to form a stable bentonite suspension; (c) Composite crosslinking: The sodium alginate solution obtained in step (a) is slowly added to the bentonite suspension obtained in step (b) under stirring. After mixing evenly, 3% by weight of calcium chloride is added as a crosslinking agent. The mixture is stirred and reacted for 2 hours to allow sodium alginate to undergo ionic crosslinking with calcium ions and to combine with bentonite sheets to form a gel network. (d) Hydrophobic modification of silane coupling agent: 1% by weight of silane coupling agent KH-550 is added to the composite gel obtained in step (c), and the mixture is stirred continuously at 80°C for 3 hours to allow the silane coupling agent to undergo a condensation reaction with the bentonite sheets and sodium alginate molecular chains in the gel network after hydrolysis, thereby introducing hydrophobic siloxane bonds. (e) Washing and pH adjustment: The modified gel after the reaction in step (d) was washed three times with deionized water to remove unreacted coupling agent and byproducts. Then the pH of the material system was adjusted to 7.0 with dilute hydrochloric acid solution. (f) Introducing root-promoting substances: Add 1.5% by weight of potassium humate to the hydrophobically modified composite gel obtained in step (e), and continue stirring for 30 minutes to make it evenly dispersed in the gel network; (g) Granulation and drying: The mixture obtained in step (f) is granulated into 2 mm particles by an extrusion granulator, and then dried at low temperature at 80°C. After pulverization, it is sieved to obtain a powdery organic-inorganic composite water-retaining and root-promoting agent with a particle size of 1 mm.

3. The special nutrient agent for increasing the yield of native grasses according to claim 1, characterized in that, The nitrogen source is one or more of urea, ammonium nitrate, and ammonium sulfate; the phosphorus source is one or more of superphosphate, monoammonium phosphate, and diammonium phosphate; and the potassium source is one or more of potassium sulfate and potassium chloride.

4. The special nutrient agent for increasing the yield of native grasses according to claim 1, characterized in that, The medium-element additives include one or more of calcium, magnesium, and sulfur; the calcium is gypsum or calcium nitrate, the magnesium is magnesium sulfate, and the sulfur is sulfur or potassium sulfate.

5. The special nutrient agent for increasing the yield of native grasses according to claim 1, characterized in that, The trace element additives include at least three of the following: chelates or soluble salts of iron, manganese, zinc, copper, boron, and molybdenum.

6. The special nutrient agent for increasing the yield of native grasses according to claim 1, characterized in that, The plant growth regulator is one or more of sodium nitrophenolate, brassinolide, and sodium naphthaleneacetate.

7. The special nutrient agent for increasing the yield of native grasses according to claim 1, characterized in that, The beneficial microbial agents include one or more of nitrogen-fixing bacteria, phosphate-solubilizing bacteria, potassium-solubilizing bacteria, and arbuscular mycorrhizal fungi.

8. A method for preparing a special nutrient agent for increasing the yield of native grasses, characterized in that, Includes the following steps: S1. Mixed pulverization: Humic acid, amino acids, nitrogen source, phosphorus source, potassium source, medium element additives and trace element additives are pulverized separately and passed through an 80-120 mesh sieve to obtain powder of each raw material. S2. Preliminary mixing: Put all the powdered raw materials obtained in step 1 into a mixer and mix at room temperature for 20-40 minutes to obtain the basic mixture; S3. Add active ingredients: Add the plant growth regulator and beneficial microbial agent to the basic mixture obtained in step 2 in sequence, and continue mixing for 10-20 minutes to ensure uniform mixing; S4. Granulation and drying: The final mixture obtained in step 3 is granulated and then dried at a low temperature of 50-70℃ until the moisture content is less than 5%; S5. Screening and Packaging: Screen the dried granules, select qualified granules with a particle size of 2-4mm, and seal them for packaging.